The reasons why the gear pump of the small four-wheel tractor dances up and down are as follows:
1. Analysis of the motor overload situation. Use a clamp meter to measure the normal current of the motor in detail. If the motor is loaded The amount of running current appears to be high and low, which is because the hydraulic pressure has been increased. If the current is relatively high when the machine is just turned on, and the current of the hydraulic system is too high before it starts running, it means there is a problem with the motor.
2. Check whether the bearings of the motor of the hydraulic system are stuck and whether the rotor is swept. When such a failure occurs, the operating technician can hear the sound.
3. If the voltage fluctuation of the external power grid becomes larger, it will be immediately clear after testing it with a multimeter. It may be caused by the high resistance of the hydraulic pump, the mismatch between the motor and the pump, the degradation of the motor insulation, and the reassembly after disassembly.